Cartridge syringe, including a cannula attaching chuck



D. c. WILLIAMS v 2,577,556

Dec. 4, 1951 CARTRIDGE SYRINGE, INCLUDING A CANNULA ATTACHING CHUCKFiled Feb. 4, 1950 Patented Dec. 4, 1951 SYRIGJNLUDIG AGANNUIiAATTACHING'CHUCK David; 0.- Willam's. N eedhar Heights, Massa:as'- signor to MacGregor Instrument Company, Needham,I Mass.,L acorporation of. Massachu- Seas Aspliestierebruaf'y 4, 195o;serial-m1421310 claims.. (c1. ice-aie?) My present invention relatestoA` cartridge syringes and particularly to novel chuckr means thereforthat enable the needles for` use with such` syringes to consist simplyof? cannulae pointed'at both ends. i

It has long beenI the: practice' for cartridge syringers, which becausethey are widely used'y in the dental iield are commonly called dentalsyre inges, to provide needles consisting of cannulae completed byproviding:k them with. scr-called head shells intermediate theirpointed@ ends. The reason' for that construction is thatthe conf-`ventional cartridge syringe receives acartiidgle closed at its frontend by a diaphragm and at its rear end by a stopper and when the syringeis assembled for use, that cartridgeis thrust forward: into a seatedposition; The cannula' receiving bore in the syringey tip has a* seatfr'the head shell so that when thehead-.s'hell is clamped against its seatby a nut threade'don the Syringe tip', the cannula is securelylocked-.to the syringe with its rear end entrant oi thev syringe topierce the diaphragm of the cartridge as it is'se'ated?. The stopper ofthe cartridge acts as: aiV plunger when engaged and driven forwardly bythe syrn'g'episton. v Y While such needles have proved satisfactory thatthey were adapted to be securely' locked t' cartridge syringes,v theyare. relatively experi; silve due tothe yfact that the head shells areseparately formed from tin AerV leadI and' tln slipped onto and swagedto thel cannnlae'i I-t-is the principal objective of this' inventintovide means whereby needles for' cartridge S'y'l ifnges'l may be simplycannu-laeot suitabletublar 'stock of desired length 'and pointed'at-both; ends,

and be securely locked tothe tips of' cartridge 'syringes as suchcannulae maybev easily' and v eili'aciently produced to sell at such alowcost that dentists or other users will, asia matter ef course,discard them after' single use ensuring'ftl-'iefpublic against theydiscomfort attendant the" se'wf a dull cannula and thev risk of.infection diie to careless sterilization. x

In accordance with my invention. I'priide cartridge syringes 'withn'r'ila gripping locked orV released by meansof a closing sle'ei'lethreaded on the Syringe tip. The cli-'lick vj'avsfs may be either a partof the sleeve-cr apart of the Syringe tip, Yaltlioughl thefoinel costiuition is'preferred as'it enables tlie'nany cart' dge syringes. now inuse, t bev readily converted', at low cost, to receive' the cannulaethat iny inveii'- tion makes possible.v For' like reasons; i pife= ferrdthat the ,chuck jaws be formedI es* 2 tegrall part-of` a-chuck elementto be attached' to a closing sleeve or a syringe tip, as may be de;isired.

In' the accompanying drawings, I have lshown illustrative'- embodimentsof myv invention from which' the'se and other of its novel features andadvantages will be readily apparent.

Inl the drawings:

Fig. 1 is a fragmentary View, in elevation',A of a cartridge syringe inaccordance withA my inven tion.

Fig: 2/ isa sectionA along the" lines 2^2 of Fig. 1i.

Fig. 3 is a perspective view of a chuck element accordance with myinvention.

Fig. 4 is a longitudinal fragmentary section shwing a-modification of myinvention.

Figi. 5 is a section, on' an enlargedV scale,y along the lines 5-5 ofFig. 4.

Fig".I 6 is a view, similar to Fig; 4, of another embodiment of myinvention.

Figr'l is alongitudinal section on an enlarged scale through. theclosing sleeve and chuck elenient of the embodiment shown in Fig. 6..

Fig; 8- is a like view illustrating the connec^-` tion of the chuckelement to the closing sleeve,

and

Fig' 9 is a section, on an enlarged scale, along the lines 9&9 of Fig.8.

In the drawings, I have indicated at I0 aconventionail cartridge syringehaving an' externally threaded tip I I to which an intermediate part'ofefcar'inulais connected and through which it exi'- tends so that-itspointed rear end is positioned 'te' 'pierce the diaphragm I2 of acartridge I3 when that cartridge is seated by the assembly of thers'yringefor use.

' In order" that' dental cannulae may consist-ofa pi'determined lengthof suitable tubing I4 beveled at both ends to establish points I5 andI'B I provide' cartridge syringes with chuck means adapted to grip anyintermediate part of the eannula'iandto be'quickly and easily operatedto iis'ui' maximum convenience to the user in atingal cannula to acartridge syringe or in releasing' Ait thereiroin.

In Figs'. I and 2; I have shown a cartridge iiirig'et I0 of the type nowwidely used as evideicedvby the headf shell seat' II at the frontendthe" :nnula receiving bore extending through the 'syringe tip I`|=.Threaded on the' tip Il is a closing sleeve I'B'liavingv a chamberI9the` port 2@ at the front end of which is forwardly and inwardlytapered but which iS dirilen's'ondl t receive freely the cannula I4.

Houses by the closing sleevek is' a chuck eiemeiit of preference, Iprovide each chuck element 2I1l with four such jaws. The free ends ofthe jaws 23 are dimensioned to lit the port 20 in the closing sleeve andare compressed thereby to vvgrip the cannula I4 as the closing sleeve I8is thread-` ed onthe tip II.

Such cannula attaching means are simple and inexpensive to produce andensure an adequate grip on the cannula but for maximum convenience tothe user, I prefer that each chuck element 2| be a part of either thesyringe tip or the closing sleeve.

InFig. 4, I have shown the syringe tip 24 as being of slightly greaterdiameter than the tip II and as having a counter bore 25 dimensioned toreceive the cylindrical extension 26 which is an integral part of but ofgreater diameter than the body of the chuck element 2|. The extension 26thus establishes a shoulder by which the chuck element 2| may be lockedto the tip 24 as by upsetting its extremity as at 21. The closing sleeve28 is substantially similar to the closing sleeve I8 except as to itscross sectional shape and as todimensions as required by the size of thetip 24.

In Figs. 6-9, I have shown a further embodiment of my invention in whichthe chuck element 2| is attached to the closing sleeve. For thispurpose, I have shown a closing sleeve29 having a chamber 30 with itsfront part tapering towards its cannula receiving port to providesurfaces 3| engageable with the chuck jaws 23 to compress them againstthe cannula I4 as the closing sleeve is threaded on the syringe tip II.The closing sleeve 29 is also shown as having a counterbore 32 andinternally threaded for attachment to the syringe tip II. ment 2| ofthis embodiment has an integral extension 33 of lesser diameter than itsbody thereby to establish a shoulder 34, and in Fig.i8, I have indicateda tool 35 having a concave work engaging face 35 by which the shoulderestablished by the counterbore 32 may b e upset, as shown at 3l' in Fig.7, to sldably connect the chuck element 2| to the closing sleeve.v v

|The closing sleeve 2S illustrates a preferred construction whether thechuck element 2| .is connected thereto, to the syringe tip, or, asshownin Figs. l and 2, is separate therefrom but conned therebetween. As willbe apparent from Fig. '7, I provide the cannula receiving port 38 as aforwardly and outwardly disposed taper with its inner extremitydimensioned to receive the cannulae but of substantially lesser diameterthan the outer extremity of the forwardly and outwardly tapering mouth39 of the cannula receiving passage 40 through the chuck element 2|.This construction of the closing sleeve and chuck elements is importantas it avoids any diiliculty in inserting the cannula into the closingsleeve and ensures that the cannula, when thus inserted, enters thechuck element 2| without the necessity of hunting for its entrance.

While it is obvious that each closing sleeve must be formed to enable itto be rmly engaged and readily rotated by the user, the cross sectionalThe chuck .ele-

and 9 are extremely satisfactory in use. The taper of the jaw closingsurfaces of the closing sleeves is, of course, that which results in thesecure clamping of a cannula with minimum rotating of the sleeve.

, From the foregoing, it will be apparent that dental syringes equippedwith my chuck means are extremely satisfactory in use since they are'-easily operated and ensure a tight grip on dental cannulae therebyeliminating the expense hitherto entailed in completing such cannulae bythe addition of head shells thereto.

What I `therefore claim and desire to secure by Letters Patent is:

1. In a cartridge syringe, a tip member, a closing sleeve member havingforwardly and inwardly inclined surfaces at the front end of its chamberand .being threaded on said tip member, and a chuck element including aplurality of resilient jaws of substantial length interconnected attheir rear ends to establish a cylindrical part and disposed to havetheir front ends engaged and compressed by said surface as said membersare threaded together, said cylindrical part and one of said membersincluding complemental portions locking them together.

2. In a cartridge syringe, an externally threaded tip member having arecess. a closing sleeve member threaded on said tip, and a chuckelement including a plurality of resilient jaws interconnected at theirrear ends to establish a cylindrical part and including an integral exetension at its rear of greater diameter than said part defining ashoulder, said extension being seated in said recess and locked to saidtip, the front end of said jaws and said sleeve member having mutuallyengageable portions disposed to eiect the compression of said jaws assaid members are threaded together.

3. The cartridge syringe of claim 2 in which portions of the tip at themouth of its recess are disposed to engage the shoulder established bythe junction of the cylindrical part and the extension of the chuckelement.

4. In a cartridge syringe, an externally threaded tip member, a closingsleeve member threaded on said tip member, and a chuck element includinga plurality of resilient jaws interconnected at their rear ends toestablish a cylindrical part andincluding an integral, rearwardlydisposed extension of lesser diameter than said part to establish ashoulder, and means in said sleeve member freely receiving saidextension but engageable by the shoulder dened by the junction of saidpart and said extension thereby to slidably connect said chuck elementto said sleeve member, the front portions of said jaws being disposed tobe forced towards each other by said sleeve member as it is threaded onsaid tip member.

5. The cartridge syringe of claim 4 in which the means in the sleevemember comprises an internal shoulder intermediate its ends.

6. In a cartridge syringe for use with a cannula pointed at both ends, atip,' a closing sleeve threaded on said tip and having a chamber and acannula receiving port at its front end in communication therewith, saidchamber having forwardly and inwardly inclined surfaces adjacent saidport and said port being forwardly and outwardly tapered, and aplurality of resilient jaws intermediate said tip and said sleevenormally spaced to establish a cannula receiving passage and disposedtoybe forced towards each other by saidy closing sleeve surfaces as saidsleeve shapes of the closing sleeves shown in Figs. 5 u is threadedA onsaid tip thereby to clamp the s s Y cannula, the inner surfaces of saidjaws being UNITED STATES PATENTS outwardly and forwardly tapered attheir front Number Name Date ends to establish a passage mouth, thecross sec- 180 850 Curtis Aug 8 1876 tional area of which at its outerextremity is 1 231497 Cook "June'26 1917 greater than that of the innerextremity of said 5 1247'023 Smith NOV 20 1917 Port- 1687'324 cook oct9'1928 DAVID C- WILLIAMS 2,455,019 McNeill Nov. so, 1948 REFERENCESCITED FOREIGN PATENTS The following references are of record in the 10Number COllntry Date le of this patent: 19,332 Great Britain Aug. 23,1912 551,720 Great Britain Mar. 8, 1943

